wayland: restore support for pre wayland 1.20
The wl_proxy_marshal_{array_,}flags API was introduced with wayland 1.19.91, so guard on those when building waffle. Otherwise we'll fail to dlsym the respective symbols at runtime.
Reported-by: Loïc Yhuel loic.yhuel@softathome.com Signed-off-by: Emil Velikov emil.l.velikov@gmail.com
@hwti can you give this a try?
OOC: what distro are you using - most recent ones are using wayland 1.20 and later.